To meet the short-distance household travel needs, a multi-functional electric tricycle integrating cargo transportation, passenger carrying, and leisure functions has been designed. This study presents the overall vehicle design scheme, determines the selection of appropriate components and parameters, and conducts overall modeling of the electric tricycle for key components. Using ANSYS Workbench, finite element analysis (FEA) is applied to evaluate the frame structure under bearing and torsional loads. The results reveal that under a 450 kg load, the maximum total deformation of the tricycle frame is 1.5 mm with a maximum stress of 86.15 MPa; under a 900 N·m bending moment, the maximum deformation of the frame structure is 1.7 mm with a maximum stress of 97.77 MPa. These findings demonstrate that the strength and stiffness of the frame meet the service requirements.